Commits on Jan 2, 2020

1. Remove support for macOS X Sierra (10.12) in Travis CI build …

   The Travis CI builds for macOS X are failing because there are no
   Homebrew bottles (packages) for macOS X Sierra (10.12).
   
   The error message in the Travis CI log is:
   
       ...
       # Upgrade to python 3.x
       brew upgrade python
       Warning: You are using macOS 10.12.
       We (and Apple) do not provide support for this old version.
       ...
   
   Note that by default the Travis CI will terminate a build after 10
   minutes if no output has been received.  Unfortunately building qt
   from source code may take hours, so installation using a Homebrew
   bottle is required.
   
   To address this issue, choose a macOS X version that has a Homebrew
   bottle for qt [1].
   
   [1] https://formulae.brew.sh/formula/qt
   
   The homebrew project currently lists having a qt bottle for:
   
     - Catalina (10.15)
     - Mojave (10.14)
     - High Sierra (10.13)
   
   No bottle is listed for macOS Sierra (10.12)
   
   In order to support as many versions of macOS X as possible, choose
   the lowest osx_image value [2] that is currently supported with a
   homebrew bottle.
   
   [2] https://docs.travis-ci.com/user/reference/osx#os-x-version
   
   At this time osx_image value xcode9.3 is listed as supporting OS X
   10.13.
   
   Unfortunately xcode9.3 did not work in the Travis CI build.
   
   By following the suggestions for troubleshooting homebrew [3] a
   discovery was made that a higher value of xcode10.1 was required.
   
   [3] https://docs.brew.sh/Troubleshooting
   
   Suggestion was to use "brew update" twice and "brew doctor" twice.
   
   The messages in the log were as follows:
   
       ...
       Warning: Your Xcode (9.3) is outdated.
       Please update to Xcode 10.1 (or delete it).
       ...
   
   Now try setting osx_image value to xcode10.1 which is listed as
   supporting OS X 10.13.

   

   gedakc committed Jan 2, 2020
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